Microsoft announced today via its blog that it will be selling its Mediaroom properties to Ericsson, in a deal that will see Ericsson become the dominant IPTV player in the industry with over 25 percent market share. Mediaroom operates as a pretty much separate company from Microsoft, with its own HQ in Mountain View and around 400 employees, and powers TV offerings like AT&T U-verse, as well as services from Deutsche Telekom, Telefonica and Telus. The deal clears the deck for Microsoft fo go all-in on Xbox as the focal point of its own TV efforts.